previewopencv for 2.2 multicamera doesnt work for python3 & C++

[neherh]

i run make for 2.2 multi-camera and get this error when i make and run the previewopencv.

./previewOpencv Detected camera on channal:A VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV ERROR! Unable to open camera

I attempted to do the python previewopencv using python3 and get this error:

[ WARN:0] global /tmp/pip-wheel-2l8ccy47/opencv-python/opencv/modules/videoio/src/cap_v4l.cpp (893) open VIDEOIO(V4L2:/dev/video0): can't open camera by index Traceback (most recent call last): File "previewOpencv.py", line 8, in Arducam_adapter_board.preview() File "/home/pi/Documents/code/RaspberryPi-master/Multi_Camera_Adapter/Multi_Adapter_Board_4Channel/Multi_Camera_Adapter_V2.2_python/AdapterBoard.py", line 81, in preview frame.dtype=np.uint8 AttributeError: 'NoneType' object has no attribute 'dtype'

[neherh]

There were a few issues. I needed to double check my opencv installation. And on top of that, I needed to change the index in videocapture for it to work.

[GlShu7]

Hi, I'm using the multi-camera adapter module v2.2 and I'm trying to connect it to my RPi 4B, i followed the instructions from ArduCam's website but I got the exactly the same errors like you got and I can not take a photo/video with the cameras. I use 3 rpi cameras v1.3 5MP. I installed before using this versions: python 3.9.6 and opencv 4.5.4

[neherh]

@GlShu7 did you do exactly as I said previously? Did you reinstall opencv and check that installation? Then did you change the index in the videocapture function? Change it from -1 to anywhere between 0-25.

[GlShu7]

Yes, but the index in the VideoCapture was (0). I used the codes from the Arducam's github : https://github.com/ArduCAM/RaspberryPi/tree/master/Multi_Camera_Adapter/Multi_Adapter_Board_4Channel/Multi_Camera_Adapter_V2.2_python

[neherh]

I would suggest that you change the index to another number that is NOT 0 or -1.

I also reverted back to the old version that didn't include the .pyc files. But that was just a preference.

[GlShu7]

I tried to change the number to 1 but still the same error

[neherh]

continue every number to 25.

[GlShu7]

I think the problem is in the line: frame.dtype=np.uint8 isn't it ?

[GlShu7]

I change it to 5 and I got another error, can't open camera by index. and after that the first error about the dtype 'NoneType'.

I use just 3 cameras and they are connected to A,C,D

[neherh]

I am sorry. I think yours might be a different issue. I simply re-installed opencv and ensured v4l was working and then changed the index value. It worked otherwise; np.uint8 wasn't the issue.

For the index, I literally kept incrementing the index until it worked. Some gave me errors, I ignored those and then went to another index. I am not sure what your most recent error is related to.